We can only guess what was going through the minds of Martin McGuiness and Elizabeth Windsor as they shook hands in Belfast last week. Several commentators recognised the symbolism of a painful process of reconciliation. Lessons from Northern Ireland about the futility of violence need to be applied in other parts of the world, and in other areas of life.
Twenty-five years after the Provisional IRA bombed a Brighton hotel during the Conservative Party conference, Parliament is to host a groundbreaking event on forgiveness, with talks from people on both sides of the incident.